Survey Overview | Survey Overview |
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The survey sample for this study was supplied by AIRPAC, Inc., located in Edmond, Oklahoma. Erdos & Morgan contracted with AIRPAC, Inc. to supply their total database of all FAA certificated aircraft pilots. Erdos & Morgan then eliminated pilots whose only certification was listed as balloon, control tower operator, flight engineer, glider, navigator, recreational, or where a certification type was not specified. Additionally all APO/FPO addresses and a number of non-individual names and addresses were removed, after which the balance of the names were reduced to the 2,000 called for in the survey specifications, by systematically eliminating every nth name. The survey sample, by virtue of its design and the way it was selected, ensures that the results of the study would be nationally representative of certificated general aviation aircraft pilots including all airline transport pilots, commercial pilots, private pilots, and student pilots. Two versions of the questionnaire were developed in order to eliminate order bias. In the first, the publications were presented in alphabetical order, and in the second the publications were presented to the respondents in reverse alphabetical order. Every other name received the reverse alpha questionnaire. On April 28, 2005, a questionnaire packet containing a two-page questionnaire, a cover letter on Erdos & Morgan letterhead, a one-dollar bill incentive, and a postage-paid reply envelope was sent to the entire 2,000-member survey sample. A follow-up questionnaire mailing was sent on June 6, 2005, to non-respondents. No incentive was included in this follow-up mailing. Completed questionnaires were returned directly to the offices of Erdos & Morgan, and at no time was AOPA Pilot identified as the sponsor of the survey. Top |